This clever loop turns a modest goblin band into an endless engine of attrition, fueled by the recursive resilience of Putrid Goblin. Each time you sacrifice the Goblin to Sling-Gang Lieutenant, its persist ability brings it right back to the battlefield—though carrying a -1/-1 counter that would normally spell its doom. That is where Railway Brawler steps in as the linchpin, dropping a +1/+1 counter onto the returning Goblin the moment it enters, which neatly counterbalances and erases the -1/-1 counter through state-based actions. With its slate wiped clean, Putrid Goblin is ready to be sacrificed all over again, letting Sling-Gang Lieutenant drain your opponents' life totals to zero in an infinite cycle of sacrifice and rebirth.